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OPA890IDBVT Datasheet(PDF) 16 Page - National Semiconductor (TI) |
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OPA890IDBVT Datasheet(HTML) 16 Page - National Semiconductor (TI) |
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16 / 34 page  OPA890 5.56kW ½ DAC7822 DB0 DB1 DB2 DB3 DB4 DB5 DB6 DB7 DB8 DB9 DB10 DB11 V R R I I R R R REF 1 FB OUT1 OUT2 2 2_3 3 GND V DD +5V 2.5pF +7.5V - 2.5V V OUT 0V V 5V £ £ OUT 0.1 F m - 5V OPA890 +5V +V S DIS V /2 S 698W 100W V O V I 50W 59W 698W 0.1 F m 0.1 F m + 6.8 F m 0.1 F m R G 750W R F 750W 50 Source W 83 77 71 65 59 53 47 41 Frequency(Hz) 100k 1M 10M 100M OPA890 SBOS369B – MAY 2007 – REVISED DECEMBER 2009 www.ti.com The frequency response of the schematic shown in Figure 48 is shown in Figure 49. Figure 48. DAC Transimpedance Amplifier Figure 47. AC-Coupled, G = +2, Single-Supply, Specification and Test Circuit Again, an additional resistor (50 Ω, in this case) is included directly in series with the noninverting input. This minimum recommended value provides part of the dc source resistance matching for the noninverting input bias current. It is also used to form a simple parasitic pole to roll off the frequency response at very high frequencies ( > 500MHz) using the input parasitic capacitance to form a bandlimiting pole. The gain resistor (RG) is ac-coupled, giving the circuit a dc gain of +1, which puts the input dc bias voltage (2.5V) at the output as well. The voltage can swing to within 1.35V of either supply pin. Driving a demanding 100 Ω load to a midpoint bias is used in Figure 49. OPA890 (as DAC Transimpedance this characterization circuit. Higher swings are Amplifier) Frequency Response possible using a lighter load. MULTIPLYING DAC SINGLE-ENDED OUTPUT TRANSIMPEDANCE AMPLIFIER Multiplying digital-to-analog converters (DACs), such as the DAC7822, can make good use of the low-power, high slew rate amplifier, OPA890. 16 Submit Documentation Feedback Copyright © 2007–2009, Texas Instruments Incorporated Product Folder Link(s): OPA890 |
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